Bryan,
The short answer is NO.
We all wish the answer was yes but sequential boxes arerestricted to the mid-engined supercars and command huge prices. Quaife offer a sequential six speed box but they start at over US$10,000 landed and are outside the majority of budgets.
Good luck with your search and keep all here informed if I am wrong (I wish I were on this ocassion).
Best wishes,
Robert